59results about How to "Brightness unchanged" patented technology

The invention discloses an LED (light-emitting diode) operating shadowless lamp of multicolour multiple-lens light source matrixes, relating to the technical field of illuminating lamps. The LED (light-emitting diode) shadowless lamp aims to solve the technical problems that a traditional operating shadowless lamp has fixed and nonadjustable illuminating depth value and lower color temperature value, and comprises a right lamp cap with adjustable illuminating depth and a left lamp cap with adjustable color temperature. The right lamp cap comprises a pedestal; more than two lamp source plates are arranged on the lateral side of the pedestal; the lamp source plates are connected with a pedestal shaft through plate connecting bars; the right lamp cap comprises at least one illuminating unit;each illuminating unit comprises a lamp panel; the LED operating shadowless lamp comprises a warm white LED lamp, a blue LED lamp, a cyan LED lamp, a natural white LED lamp, and a cold white LED lamp; the included angles between the lamp source plates are synchronously adjusted by a drive motor; the beam focus of each lamp source plate moves downwards, and the warm white LED lamp, the blue LED lamp, the cyan LED lamp, the natural white LED lamp and the cold white LED lamp are combined to realize adjustable color temperature of the shadowless lamp; moreover, the color temperature can be adjusted to 5,000K at most; therefore, the LED (light-emitting diode) operating shadowless lamps can adapt to various surgery demands.

The invention discloses an LED color temperature adjusting device and method based on single-channel PWM (pulse width modulation). The LED color temperature adjusting device comprises a microprocessor, a warm color temperature switch control circuit, a cold color temperature switch control circuit, a warm color temperature LED lamp and a cold color temperature LED lamp. The method includes: respectively inputting preset-frequency PWM signals to the warm color temperature switch control circuit and the cold color temperature switch control circuit; according to the input PWM signals, controlling brightness of the warm color temperature LED lamp and the cold color temperature LED lamp which are connected with the warm color temperature switch control circuit and the cold color temperature switch control circuit respectively by the same. The LED color temperature adjusting device is simple in structure, the method is simpler and more reliable in realization, resource using efficiency can be improved effectively, and changing amplitude of brightness of the LED lamps can be uniform, so that brightness can be maintained unchanged when color temperature is adjusted; adjusted color temperature can change continuously, so that color temperature adjusting range is effectively expanded, and actual using effect of LED color temperature changing is improved. The LED color temperature adjusting device and method can be widely applied in the field of LEDs.

The invention relates to a liquid crystal display television display technology and solves the problem that brightness variation is caused by existing liquid crystal display television color temperature adjustment. The technical scheme is summarized as follows: after a target color temperature value and a target brightness value are set, an output image is analyzed, an image backlight color temperature is obtained, then RGB three-primary-color luminous flux corresponding to the color temperature is matched by utilizing a color mixture database based on an RGB three-primary-color mixture algorithm, then obtaining drive currents for RGB three primary colors according to a changing curve between the luminous flux and the drive currents, respectively driving a red light chip, a green light chip and a blue light chip of the LED backlight to obtain the target color temperature, and adjusting the drive currents for the RGB three primary colors for achieving the target brightness value under the condition that the ratio of the RGB three-primary-color luminous flux is maintained to be constant. The method provided by the invention has the beneficial effects that brightness does not change after the color temperature is adjusted, and color temperature consistency of different televisions is good by virtue of white balance adjustment. The method provided by the invention is especially applicable to a liquid crystal display television based on an RGB three-primary-color LED backlight.

The invention discloses a high-efficiency LED lighting lamp linear driving circuit. The circuit comprises four parts, including an input protection circuit, a bridge type rectifier, a constant currentcontrol circuit and an overvoltage shutdown circuit, wherein the constant current control circuit is similar to a conventional linear driving circuit of an LED lighting fixture, the overvoltage shutdown circuit is connected in series between a negative terminal of the constant current control circuit and a negative terminal of the rectifier bridge and is composed of an input voltage sampling circuit, a reference power source, a comparator CP and an N-channel power switch tube, the circuit is generally applicable to multiple types of small and medium power LED light source lighting fixtures, and the circuit has advantages of high luminous efficiency, small temperature rise of a constant current control tube, small current surge current, wide input voltage range and the like.

The invention discloses a LED (light-emitting diode) driving circuit which comprises a light emitting module and an AC (alternate current) first input end and an AC second input end which are respectively arranged at both ends of the light emitting module, wherein the light emitting module comprises a first LED group and a second LED group which are connected in parallel; and both the first LED group and the second LED group comprise a plurality of LEDs which are correspondingly connected in series and have ethe same conduction directions. According to the invention, AC square signals with equal sizes and opposite phases are input into the light emitting module by the AC first input end and the AC second input end, so that the LEDs of a LED lamp bar are alternately lightened, the LED backlight is uniform, the LED brightness is strengthened, the display effect is better, the driving voltage is also reduced, the electric energy is saved and the use safety is ensured. Moreover, the LED driving circuit has the advantages of simple and reasonable circuit structure and easiness for implementing. The invention also further discloses a LED driving method and the LED lamp bar.

The invention provides a self-adaptive image enhancement method and device based on image gray levels, and relates to the technical field of image processing, and the technical scheme comprises the steps: obtaining the occurrence frequency of each gray level of a to-be-processed image, and storing the gray levels, of which the gray levels exceed a preset gray level threshold value, in a preset array; reading the gray values according to the serial numbers of the preset array in sequence, and redefining according to the corresponding relationship between the gray values and the serial numbers to obtain new gray values; and performing adaptive enhancement processing on the to-be-processed image according to the new gray value. According to the scheme, the image can be enhanced in a self-adaptive mode, the image brightness is basically unchanged, details of the excessively dark part of the image can be richer, the excessively bright part of the image can be restrained, and therefore the fidelity effect is achieved.

The invention provides a polymer fluorescent nanometer particle. The polymer fluorescent nanometer particle is applied to liquid crystal display devices, and comprises a polymer nanometer particle, and rhodamine dye and hydrophilic-lipophilic balancing matter loaded on the polymer nanometer particle, wherein the polymer nanometer particle, the rhodamine dye and the hydrophilic-lipophilic balancingmatter are combined into a whole through electrostatic attraction; the hydrophilic-lipophilic balancing matter comprises at least one in perchlorate, sodium tetraphenylborate, sodium tetrakis (4-fluorophenyl) borate dihydrate and trityl tetrakis (pentafluorophenyl) borate. The polymer fluorescent nanometer particle can absorb yellow-orange light and emit red light, can be applied to liquid crystal display devices, so as to reduce interference of yellow-orange parasitic light and enhance the color gamut, and meanwhile emit red light to guarantee invariability of lightness; meanwhile the rhodamine dye is loaded on the polymer fluorescent nanometer particle, can avoid agglomeration of the rhodamine dye, improves the absorption efficiency and fluorescence efficiency, and the polymer fluorescent nanometer particle has a wide application prospect to the liquid crystal display devices.

The invention discloses a linear switching constant-current LED drive circuit for control over peak current, and relates to the field of power source drive circuits. Compared with an existing linear constant-current LED drive circuit, and according to the linear switching constant-current LED drive circuit for control over the peak current, an integrating capacitor is connected to a loop of a drive chip in parallel, and average current passing through an LED lamp bead can be kept to be constant through the integrating constant-current mode; in addition, due to the fact that a loop formed by an operational amplifier, a switching selector and a high-voltage power MOS is added to the loop of the drive chip to limit the peak current passing through the LED bead, useless power consumption of a system can be reduced, working efficiency of the system can be improved, heat produced in the working process of the drive chip is reduced, the required rated current of the LED bead can be effectively reduced, the luminous efficiency of the LED bead is improved, the luminous decay of the LED bead slows down, the service life of the LED bead is prolonged, and cost of the system is reduced.

The invention discloses a backlight module, a display device and a backlight color temperature adjusting method. The backlight module comprises a diffusion plate, an optical film, a reflector plate and a backlight source which is arranged on the reflector plate and is used for adjusting a color temperature value and a brightness value; and the backlight source and the reflector plate are arranged on the light inlet side of the diffusion plate, and the optical film is arranged on the light outlet side of the diffusion plate so as to provide incident light for the display screen. According to the invention, the backlight source used for adjusting the color temperature value and the brightness value is arranged, the current value proportion of the LEDs in the backlight source can be adjusted when the color temperature value of the display device is adjusted, and therefore the brightness of the display device is not changed.

The invention relates to a mining intrinsically safe car backing-up alarming device. More than four middle sound transmission holes, front mounting grooves and rear mounting grooves are formed on the circumference of the inner chamber of a casing; a cable connecting plug is hermetically mounted on a mounting base at the lower part of the casing; a horn is mounted on a rear window of the casing inan inverted manner; a waterproof diaphragm is hermetically mounted on the rear end surface of the casing through a pressure plate; a front cover is mounted at the front part of the casing; a transparent lid is hermetically mounted at a window of the front cover and forms a closed watertight seal cavity; a middle cover plate on which a circuit board, an alarm lamp and a camera are mounted is mounted on the front cover or / and the inner chamber wall of the casing; more than four front sound transmission holes at the front part of an annular groove on the front cover and the middle sound transmission holes on the casing are arranged in a staggered manner; drain holes are formed at the bottom of the annular groove; a rear cover with a spherical surface is mounted at the rear part of the casingand opposite to the waterproof diaphragm; and a cavity between the rear cover and the casing is communicated with the middle sound transmission holes and the front sound transmission holes to form sound channels. The mining intrinsically safe car backing-up alarming device has the advantages of reasonable structure, convenience and reliability in use and flushing resistance, and can dynamically capture video of the rear part of a vehicle.

The invention discloses a brightness adjustment method, device and computer storage medium. The method includes: receiving a mode switching instruction for switching from a first graphics card mode to a second graphics card mode; The current brightness and brightness threshold of the mode; based on the first brightness matching range, the current brightness and the brightness threshold of the first graphics card mode are matched to determine the expected brightness, and the expected brightness is used to characterize the match with the first graphics card mode The standard brightness corresponding to the current brightness; matching the expected brightness based on the second brightness matching range to determine the target brightness of the second graphics card mode; adjusting the screen brightness to the target brightness according to the brightness adjustment rule to maintain the graphics card The screen brightness is consistent before and after switching.

The embodiment of the invention discloses a screen display control method and a mobile terminal, wherein the screen display control method comprises the steps of starting and displaying a control slide block at the first side edge part of the current display screen; if the condition that the control side block slides to the opposite second side edge from the first side edge is detected, lowering the brightness of the first region of the current display screen or the brightness of the second region beyond the first region, wherein the first region is a region in which the control side block passes through when sliding from the first side edge to the second slide edge. The technical scheme provided by the embodiment of the invention has the advantages that the brightness of the local region of the display screen can be regulated according to requirements; the energy consumption is reduced; the energy saving is better realized.

The present application relates to a picture color adjustment method, device, computer equipment and storage medium. The method includes: acquiring the RGB original color component value and original brightness value of the picture to be adjusted; if an adjustment instruction for any color component of the picture to be adjusted is received, then acquiring the color adjustment variation of the color component, Adjust the original color component value of this color based on the amount of color adjustment change, and perform the opposite adjustment operation on the original color component values ​​of the other two color components; if an adjustment instruction for the screen brightness of the screen to be adjusted is received, obtain The brightness adjustment variation used to adjust the original brightness value to the target brightness value, and adjust the original brightness value of the picture to be adjusted based on the brightness adjustment variation amount. By adopting the method, the accurate adjustment of the color of the picture can be realized, and the visual effect of the picture can be guaranteed.

The present invention relates to the technical field of intelligent electronic equipment. By providing an energy-saving lamp module, it includes a power chip, a single-chip microcomputer, a plurality of CMOS switches and a plurality of LED lamps, and the power output end of the power chip is connected to one end of a plurality of CMOS switches. The other end of the switch is connected to a plurality of LED lamps respectively, and the signal control terminals of the single-chip microcomputer are respectively connected to a plurality of CMOS switches and the power supply chip; The first constant current, at the same time, the single-chip microcomputer sends PWM signals to a plurality of CMOS switches respectively, to control a plurality of CMOS switches to carry out PWM dimming to a plurality of LED lamps; The control signal is used to control the power supply chip to output a constant voltage and a second constant current, wherein the second constant current is smaller than the first constant current, thereby effectively saving electric energy and prolonging life.